Set of spacers for a backpack



FIG. 1 is a perspective view of a set of spacers for a backpack, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a right-side view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The broken lines showing the backpack are illustrative of environmental structure only and form no part of the claimed design. 

CLAIM The ornamental design for a set of spacers for a backpack, as shown and described. 